What it means
The clutch pedal position sensor B reports a circuit intermittent/erratic fault. Redundant pedal position channel is unreliable.
At a glance
- Usually lights the check-engine light
How it works
Clutch pedal position sensor B supplies a redundant pedal-travel signal for the control module to cross-check and use in transmission control. This code sets when the B-channel signal is erratic or intermittently lost as the pedal moves or the vehicle vibrates.
Common causes
Most likely first.
- Position sensor failed
- Wiring fault
- Connector with intermittent contact under vibration
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
How to diagnose it
- Check freeze-frame and live data for brief dropouts in sensor B and note whether they coincide with pedal movement or vibration.
- Inspect the B-channel connector and wiring near the pedal for loose terminals, corrosion, chafing, or a harness that moves with the pedal.
- Watch sensor B live data while gently moving the harness and connector with the vehicle stationary to look for dropouts.
- Check the B-channel supply, ground, and signal connections for intermittent continuity using the wiring diagram and manufacturer’s procedure.
- If the wiring remains stable, test sensor B through its travel for an intermittent or uneven output.
Common fixes
- Secure a loose sensor B connector or repair an intermittent terminal.
- Repair chafed or broken wiring in the sensor B circuit.
- Replace clutch pedal position sensor B if its signal drops out despite sound wiring.
- Complete any required pedal sensor calibration after repair.
Can I keep driving?
Although limp mode is not indicated by this code alone, the intermittent B-channel signal can disrupt clutch-related shifting without warning. Avoid driving if the clutch or gear changes become erratic, and have the fault checked promptly.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.